How much improvement would i expect to gain. I think I have a budget of around $1100 +/-

Ideas for what im thinking

Core i7 3770K
GTX 660TI or 670 not really sure if the 670 is worth the extra
power supply im guessing i really don't need such a powerful one these days my last one seems to be a bit of an overboard 500w-550w good enough?
16g ram not sure ill need it though
guess i need a case as well whats a good quite case?

The only thing I'd likely upgrade is the GPU. Your CPU shouldn't be any sort of bottleneck, and if it were you could easily get another 5-600MHz out of it w/ a decent after market HSF. Your PSU will also be fine for any videocard on the market. 16GB of ram will also not benefit games. If you can afford a GTX780 that is what I'd suggest w/ that kind of budget.

If I was willing to part with my spare 570, you could slap that in and call it a day. Yeah, pretty much the CPU upgrade would be so minor and since you over-clock it'd be cheaper to just improve the overclock on the CPU if you are noticing anything that is bottlenecked by it. Your best bang for your buck is to try and get SLI 570 instead of replacing the card. I ran that for quite a while and it works well.

So i actually have a Corsair A70 heatsink should i just overclock the CPU a bit more and and upgrade the GPU then. How big a difference you guys think i should go with for the GPU 660-670 i guess if im just doing the GPU i would look for something around $300 range.

I think i was thinking that i would upgrade since iv been seeing some interesting graphical errors. Not sure if my card is dying or not, I find my nvidea drivers seem to corrupt a lot not sure if that's normal ether.

I think i was thinking that i would upgrade since iv been seeing some interesting graphical errors. Not sure if my card is dying or not, I find my nvidea drivers seem to corrupt a lot not sure if that's normal ether.

They do, all the time. It depends on the game your playing. I've had issues before where I swore it was the cards fault. All kinds of artifacts until I switched up the drivers. Either older or newer. That's not to say there isn't a problem with the card, just that corruption in games is more often than not the fault of the GPU driver.